package netWork.tcp;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TcpEchoServer {
    private ServerSocket serverSocket = null;

    public TcpEchoServer(int port) throws IOException {
        serverSocket = new ServerSocket(port);
    }

    public void start() throws IOException {
        System.out.println("启动服务器！");
        ExecutorService threadPool = Executors.newCachedThreadPool();
        while(true){
            Socket clientSocket = serverSocket.accept();

            threadPool.submit(()->{
                processConnection(clientSocket);
            });
            //processConnection(clientSocket);
        }
    }

    private void processConnection(Socket clientSocket){
        System.out.printf("[%s, %d] client online!\n", clientSocket.getInetAddress().toString(), clientSocket.getPort());
        try(InputStream inputStream = clientSocket.getInputStream();
            OutputStream outputStream = clientSocket.getOutputStream()){

            Scanner scanner = new Scanner(inputStream);
            PrintWriter printWriter = new PrintWriter(outputStream);

            while(true){
                if(!scanner.hasNext()){
                    System.out.printf("[%s, %d] client offline!\n", clientSocket.getInetAddress().toString(), clientSocket.getPort());
                    break;
                }

                String request = scanner.next();

                String response = process(request);

                printWriter.println(response);
                printWriter.flush();

                System.out.printf("[IP:%s, Port:%d] req:%s, resp:%s\n", clientSocket.getInetAddress().toString(), clientSocket.getPort(),
                        request, response);
            }

        }catch (IOException e){
            e.printStackTrace();
        }finally {
            try {
                clientSocket.close();
            }catch (IOException e){
                e.printStackTrace();
            }
        }
    }

    private String process(String request){
        return request;
    }

    public static void main(String[] args) throws IOException {
        TcpEchoServer tcpEchoServer = new TcpEchoServer(8080);

        tcpEchoServer.start();
    }
}
